Invasive water primrose

Invasive water primrose (Ludwigia species) and water hyacinth (Eichhornia crassipes) line the marsh edge in Mandeville Cut near the Port of Stockton, California’s third largest port.  Invasive aquatic vegetation – dominated by Brazilian waterweed, water hyacinth, and water primrose – has increased exponentially in recent years, clogging about 17,400 acres of waterways across the Delta. These invasive plants create safety hazards for boaters, and obstruct navigation channels, marinas, and irrigation systems.